fix: Added official youtube link of Layer5 in README.md

[Viveksati5143]

Description

This PR fixes #29 Closes: #29 Notes for Reviewers

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[vishalvivekm]

Thanks @Viveksati5143 for the quick fix 🚀

@leecalcote @Chadha93

[Viveksati5143]

Hi @Chadha93 @leecalcote, Can you please review it as well for the pr to get merged?